| /* |
| * Direct Stream Digital (DSD) decoder |
| * based on BSD licensed dsd2pcm by Sebastian Gesemann |
| * Copyright (c) 2009, 2011 Sebastian Gesemann. All rights reserved. |
| * Copyright (c) 2014 Peter Ross |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_DSD_H |
| #define AVCODEC_DSD_H |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #define HTAPS 48 /** number of FIR constants */ |
| #define FIFOSIZE 16 /** must be a power of two */ |
| #define FIFOMASK (FIFOSIZE - 1) /** bit mask for FIFO offsets */ |
| |
| #if FIFOSIZE * 8 < HTAPS * 2 |
| #error "FIFOSIZE too small" |
| #endif |
| |
| /** |
| * Per-channel buffer |
| */ |
| typedef struct DSDContext { |
| uint8_t buf[FIFOSIZE]; |
| unsigned pos; |
| } DSDContext; |
| |
| void ff_init_dsd_data(void); |
| |
| void ff_dsd2pcm_translate(DSDContext* s, size_t samples, int lsbf, |
| const uint8_t *src, ptrdiff_t src_stride, |
| float *dst, ptrdiff_t dst_stride); |
| #endif /* AVCODEC_DSD_H */ |
